反应详情

Sodium nitrite (50 mg, 0.73 mmol) in 1 ml of water was added slowly to a solution of (S)-3-acetyl-N-(1-(3-(4-cyano-3-nitrophenyl)-1H-pyrazol-1-yl)propan-2-yl)-1H-pyrazole-5-carboxamide (250 mg, 0.66 mmol) in water (2 ml), sulfuric acid (71 μl, 1.33 mmol) and MeCN (3 ml) at 0° C. After 15 min potassium iodide (0.22 g, 1.32 mmol) in 1 ml of water was added. Reaction mixture was stirred at RT for 2 h and then poured into 10 ml of water. Thus resulting precipitate was filtered and washed with 10% sodium bisulfite solution and water. Crude product was purified by CombiFlash (column: silica, eluent: 3-10% MeOH in DCM) to yield 75 mg (23%) of the title compound. 1H-NMR (400 MHz; MeOD): δ 1.27 (d, 3H), 2.55 (s, 3H), 4.35 (m, 1H), 4.39 (m, 1H), 4.57 (m, 1H), 6.63 (d, 1H), 7.28 (br s, 1H), 7.42 (s, 1H), 7.57 (d, 1H), 7.66 (d, 1H), 7.93 (br s, 1H), 8.35 (s, 1H).

1. customReaction mixture
2. customThus resulting precipitate
3. filtrationwas filtered
4. washwashed with 10% sodium bisulfite solution and water
5. customCrude product was purified by CombiFlash (column: silica, eluent: 3-10% MeOH in DCM)